Switching mechanism for telephone-exchanges.



F. A. LUND'QUIST. SWITGHING MECHANISM FOR TELEPHONE EXCHANGES.

APPLICATION FILED FEB. 1, 1905.

vPatetnfited Dec. 9, 1913.

6 SHEETS-SHEET l.

' InuenTor Hg. I. w 7

PIA. LUNDQUIST. SWITCHING MECHANISM FOR TELEPHONE EXCHANGES.

APPLICATION rum FEB. 1. 1905.

4 6 8HEBT8-SHEBT 2..

III

IMIHHH WIN Fig.2.

. M ZYZZILL -r 2s W W mTorney l i l l Patnted Dec. 9, 1913.

15%} 1% memem Deo.9,1913.

inuenTor' WiTnasses;

Fig.5.

' F. A. LUNDQUIST. SWITCHING MECHANISM FOR TELEPHONE EXCHANGES.APPLICATION FILED EBAl, 1905.

Patented, Ham. 9, 11913.

6 SHEETS-SHEET MH8L128- fi F an van i'oz I W a, W- I 3591 i114 GU01 mlmi;

P. A. LUNDQUIST. SWITGHING MECHANISM FOR TELEPHONE mun/11mm.

' APPLIGATION FILED FELL, 1906.

Patented Dec.9,1913.

6 BHEETS-BHEET 5.

ymph Leases 27W 1 P. A. LUNDQUIST. SWITCHING MECHANISM FOR. TELEPHONEEXCHANGES.

APPLICATION FILED FEB. 1, 1905;

6 SHBETS'SHEET 6.

a Du LIU n 6 lltl till

ENT OFFICE.

lll'lltlll .h. LWNJDQWTQ -h 01F CHIWAGQ), ltLLINtJIEl, AQ$IGNOR, BYMESNE ASSIGNMENTS, T WESTERN ELEGTMIC CUMPANW, A CURPORATIQN OFILLINOIS.

SWIICHXNG MEUHANNEH IlOR TELEPHONE-EXCHANGES.

llhpecillcatleu of better-c Yatent.

Patented Dec. 9, 1913.

.typlication theft February 1, 190%. herial No. 243,66t.

To all whom may coeccra lBjclt ltnown that l, l nnnn 1h. lbunnother acitation oi the limited States of America,

and a resident oi Chicago, county ct tjooln and State of lllinois, haveinvented certain new and useful improvements in Switching ltllechanisinsfor 'l7elephone-Enchengaa, of which the following ie a specification,

lily invention rclatee to switchi mechatalents for automatic telephonxflh hct and has tor its object improvement and simplification at eachdevices.

ll-he present device is especially adapte for use in the kindofexchanges illustrated in my Patent No. 776,524 issued Dec. 6, 1904C,

but its use involves a modification in the preliminary part of theart-angernent. lln that patent it showed main switches and auxiliaryswitches. There was a main switch for each subscriber, and each mainswitch had one hunderd pairs of contact hints. This made the switcheswhich were individual for each subscriber large and exlhfilt fi. 'l beultimate object ot the device of the preterit "application is tosubstitute tor one hundred such large switches, in the kind of exchangeindicated, one hundred small switches each having ten or twelve pairs ofcontact points, and ten or twelve large switches. The presentapplication is limited to this small switch and its operation.

in the accompanying drawings Figures 1, 2 and 3 are respectively front,side and rear elevations of the individual switches mentioned; Fig. l isa diagram at the mechanical operation; Fig. 5 is a. partial electricaldiagram showing the automatic operation; Fig. 6 is a complete electricaldiagram; lt ig'. 7 is a section on line 7-7 of Fig. 1; and big. 8 is asection on line li-8 ot' Fig. l.

The switch coneiats ot a pair oi contact matters P and l insulated tromeach oth,e.r.

and moved over corresponding sets of contact oints P and P by means at aratchet whee ll". These contact points are insulatingly held between aplate ll and a bracket h (Figs. 2 and 8) secured to a bridge D betweenthe side plates it). There is a magnet A. for moving" the wheel, and arelay a it aseocieted with it so that when the switch is etarted intooperation by an impulse controlled from the subscribers station, themovement automatically continues until it ie Stopped by an impulseautomaticallyeeut' t rWgfh a magnet ll. A magnet- C and its relay 0serve to release the switch so that it they return to its normalposition in the "ordinary manner.

Referring to Fig. 4 when the armature il i actuated by the magnet A thepawl A advances the wheel F on which the contact makers P and P arecarried as before men tioned. it boldingpawl E prevents a bacle wardmovement of the'wheel F until it is released. The pawl A has a tailpiece A which normally engages 2; pin A and is thereby held clear of thewheel F so as not to prevent its release. This mechanism, and thathereafter to be described, is held by, and largely between, two sideplates D, which side plates are connected together by bridges D Thedifferent parts are secured by screws either to the side plates or tothe bridges, or to brackets connected to the plates or bridges. Theupper ends of the side plates have at the rear upwardly projectingportions D (Fig. El) which. are arranged to fit into suitable socketsin, a framework intended to support a series of similar switches.Secured in a block of insulation D held between the lower ends of theside plaice, are a series of springs D; each of which is adapted to makeelectrical connec tion with a fixed contact on the framework for holdinga series of switches. These things are matters of convenience in thesetting up and taking down of switches lo catcd in an exchange. As theoperation of the mechanism can be better understood by diagrammaticviews than otherwise, rcierence will be had principally to Figs. 1-, 5and G, which are diagramnmticrepresentations of the mechanism shown inFigs. .1, E2, 3, 7 and S.

When ainiinpulse flows through magnet ll, the arnulture ll engages ahook on the bar B and when the armature released its retractile springdraws down the bar l5. On the upper end of the bar B is a piece ofinsulation B, the oliice of which is to shift the electrical connectionsof the adjacent springs when said bar is depressed by armature ll Thesesprings are shown are lying in a horiaontcl position zitthe tops ofFigs. 1., 2 and 3. [is will be hereinafter explained, this action breaksthe circuit for the magnet A and etops the automatic advance of theswitch.

The magnet: G is used for release. lite orill) lid

vided with a hook adapted to engage an arm E secured to the holding pawlE, and

the other end of which is adapted to engage a stationary pin C The jointbetween C 'case F and C is a friction joint so that C naturally staysinthe position into which it is put by force. I 1

When an impulse flows through C and the armature C is attracted, thebell crank C strikes the pin C and forces the hook on C behind the arm E-lVl1en the circuit is broken through 0, and the retractile springreturns G to its normal positionythe hook draws the arm E inwardreleasing the holding pawl E from the wheel F. At the same timethe'other end of the arm E engages the bar B so as to release it fromthe armature B thus permitting B and the adjacent springs to resumetheir normal position.

The ratchet wheel F and contact makers P and P are secured to a shaft F(Figs. 1, 2 and 8), and also secured to the same shaft is an ordinaryclock spring located in a spring The release of the holding pawl E (Fig.4) from the wheel Ii permits the spring in the case F to return thecontact n ers to their normal position. When the ne...v operatingimpulse flows through A its armature strikes the bell crank C andreleases its hook from E so that the holding pawl may again engage theratchet wheel F.

Each switch of this kind in the exchange is connected to a subscribersstation by wires at and 39 as shown in Fig. 6. Both the switch andthcstation have ground connections. \Vhen a subscriber wishes to start hisswitch into automatic operation he temporarily closes the connectionbetween his end of the line 4 and ground. A current then flows:X-'l2a-34-station-g1ound -X. This operates the magnet-(I and causes itsarmature 13 to connect to spring 12. A

This circuit is shown in Fig. 6. As the automatic operation now to bedescribed .can be better understood by separating it from other things,reference may be had to Fig. 5, which figure is especially designed toillustrate this operation.

When the impulse flows through A it advances the ratchet wheel l? andmoves F away from 17 permitting 17 to close connec tions to 1G. 'ihcmovement of the armature A also breaks electrical connection at 20 andat 30.

The operations so far described are the direct result of the circuitclosed by the subscriber at his station. As soon as he breaks thiscircuit the armature 13 of the relay a falls back and breaks theconnection to 12. This breaks the circuit for A, and when the armature Afalls back it closes a new ciriiient of A again breaks the c1rcu1t for aat 20. But

cuit for a as follows: X-1-2a 3-4-' l6--17-1819-202l-2223-24-25-- le -X.This again closes the circuit for A at 12 and causes'a new move- Thisnew movementof A the current must not cease flowing through at until Ahas completed its movement otherwise that movement never would becompleted because breaking the circuit through 7 the relay immediatelycauses a break of the circuit through the operating magnet. To preventthe current being stopped too soon through the relay, the armature 13closes a branch as follows: from 4 26-27-28 2930-22 etc'. This is helduntil at the final part of the movement of the armature A the'circuitfor the relay (1 is broken at- 80. This break permitsthe armature 13 tofall back and break the circuit for A at 12. This in turn permits thearmature A to also fall back to its normal position, in which positionit again closes the circuit for the relay. It will be seen from thisthat the closure of a preliminary circuit for the relay by thesubscriber causes the, relay to close a circuit for the operatingmagnet, and thus in turn to cause a movement 0 the switching mechanism.Nothing further then occurs until the subscriber breaks the circuit hehas closed when the relay in turn breaks the circuit for the operatingmagnet. Nothing electrical then occurs until the ar mature of theoperating magnet has reached its normal position when it closes a newcircuit tor the relay. This again causes the relay to close the circuitonce more for the operating magnet. The operating magnet in turn breaksthe circuit for the relay but does not do so until it completes itsmovement. circuit for the operating magnet, the arina- The relayimmediately breaks the f ture of the latter falling back almostsimultancously with that of the relay. When the armature of theoperating magnet again reaches its normal position it again closes thecircuit for the relay thus starting a second cycle of automaticoperation.

In still more condensed language, we may say, that the subscriber makesand breaks a circuit't-he result of which is to cause one completeoperation of a relay and the magnet'associated therewith. Upon thecompletion of this operation the magnet-starts a series of interactingmakes and breaks with the relay, the two being so related that eachcauses the other to operate, the successive operations being continuousuntil stopped by some outside force.' 4

Each time that the armature A is actuated it advances the contactmakers, (or

wipers as they are commonly called) P and of a pair of interactingmagnets arranged' .to automatically representing an idle line, animpulse will 'fiow from said battery through said point,

trolled by an impulse a third magnet operated by such an impulse, andmeans by which an operation of the third magnet will stop the operationof the first mentioned magnets.

7. The combination with a battery, two magnets, and connections for saidmagnets so arranged that upon an initial movementbeing given to one ofsaid magnets the two of them will start upon an automatically continuousseries of operations, of a circuit finding contact maker operated by oneof said magnets, a third magnet connected in an incomplete circuit forsaid third magnet, and means by which the operation of said third magnetwill stop the automatic operations of the first mentioned magnets.

8. The combination with a battery, two magnets, and connections for saidmagnets so arranged that upon an initial movement being given to one ofsaid magnets the two of them will start upon an automatically continuousseries of operations, of a circuitfinding contact maker moved step bystep by the operations of one of said magnets, a third magnet connectedin an incomplete ciredit for said third magnet, means by which saidcontact maker may complete the circuit for said third magnet through anyone of a serigs of contacts touched by it in its step by ste movement,and means by which an operat on of the third magnet will stop theautomatic operations of the first mentioned magnets.

9. The combination with'a circuit finder.

and a circuit breaker, of two magnets for automatically operating thecircuit finder, a third magnet for operating the circuit breaker, meansby which the circuit finder completes a circuit through the circuitbreaker by way of some one of a plurality of paths, and means by whichthe operation of the circuit breaker stops the operation of the circuitfinder.

10. In a trunk selecting switch, a pair of wipers and a single row ofcontact points for each wiper, a pair of magnets arranged toautomatically advance said ,wipers over their contact points to find anidle trunk, and automatically operating means confiowing over :1 foundtrunk for stopping said wipers.

11; The combination with a switching mechanismcomprising a pair ofwipers and a single row of contact points for each wiper, said rows ofcontact points being in line with the movements of said wipers, of twomagnets arranged to be started into operation by an impulse sent throughone of them andalso arranged to keep each other impulse flowing over incontinuous operation to advance said wipers to find an idle pair ofcontact points in said rows of points, and automatic means operatingthrough one of the found points for stopping the operation of-saidmagnets.

12. The combination with two magnets-sir ranged to act as relays foreach other so as to keep each other in continuous operation, a circuitfinding contact maker operated thereby,- and a series of circuitssuccessively engaged by by said contact maker through an idle one ofsaid circuits, and means eration of the third magnet will interrupt theinteracting operation of the first men tioned magnets;

13. The combination with aseries of circuits, a magnet adapted to beoperated by an any one. of said circuits, and a circuit finder adaptedto complete connections for said magnet over an idle one of saidcircuits, of automatically operating means consisting of a second magnetand an associated relay; for moving said circuit finder from circuit tocircuit in said series of circuits, and means by which an operationof'said first named magnet causes a stoppage of said circuit finder on:1 found idle circuit. .14..The combination with a series of circuits, amagnet adapted to be operated by an impulse flowing over any one of saidcircuits, and a circuit finder adapted to complete connections for saidmagnet over an idle one of said circuits, of other magnets and a sourceof electric current arranged to automatically move said circuit finderfrom circuit to circuit in said series of circuits, and means by whichan oaeratioii of the first mentioned magnet will disconnect the lastmentioned magnets from the source of current to cause a stoppage of thecircuit finderon a found idle circui 15. The combination with a ratchetwheel, a magnet and pawl for driving it, and a holding pawl, of wiperscarried by said wheel, a telephone line normally disconnected from saidwipers, a magnet for auto matically connecting the telephone line to thewipers iipon actuation, and a release magnet arranged to simultaneouslyrelease said holding pawl from said wheel and said line from saidwipers.

16. A switch provided with contact makers adaptedto make contactinsuccession with contact points representing idle and busy trunks, amagnet and devices as sociated therewith for automatically advancingsaid switch stcp-by-step upon the reception of an initiatory electricalimpulse, a pair of subscribers lines terminating in disconnected contactsprings, other adjacent contact springs provided with conncc' tions tosaid magnet and said wipers, and a said contact maker, of a third magnetarranged to have its circuit closed by which an opsecond magnetcontrolled through one of Signed at Chicago, 111. this 28th day of saidWipers and a contact point represent Jan. 1905.

ing an idle lino for shiftin the last named y 1 Contact springs so as toi terrupt the op- FRANK LUNDQJUIS'I' eration of thefi'rst named magnetand to Witnesses:

extend ,the connections of @he subscribers hues to sand wlpers.

A. L. BUCHANAN, C. L. REDFIELD.

Copies of this patent may be obtained for five cents each, by adaressingthe Uommissioner of Patents.

Washington, IL 0.

